MAST THERAPEUTICS INC

CUSIP: 576314108 Class: COM

WEXFORD CAPITAL LP's Holding History (CIK: 0001048462)

Note: Option positions (PUT/CALL) are excluded.

Q4 2013
Shares 89,360 Value ($000) $41 Avg Close — Range —
Q3 2013
Shares 39,420 Value ($000) $17 Avg Close — Range —